I can’t really understand what you’re asking here. You want to know if some other random app running on this device has opened a connection to somewhere that is doing encrypted tunneling? If so, I can’t think of any way in which that would even be remotely possible, unless you knew the specific fingerprint of the tunnel it was using, and perhaps not even then.
I looked briefly at the plugin you linked. It provides an encrypted tunnel, so the only presence/absence it would be reporting would be involving connections that it itself has forged (which makes sense). It can’t report on connections it doesn’t initiate.
